tornado.process.fork_processes now raises SystemExit if all child
processes exit cleanly rather than returning None. The old behavior
was surprising and inconsistent with most of the documented examples
of this function (which did not check the return value).

On Python 2.6, tornado.simple_httpclient only supports SSLv3. This
is because Python 2.6 does not expose a way to support both SSLv3 and TLSv1
without also supporting the insecure SSLv2.

tornado.websocket no longer supports the older “draft 76” version
of the websocket protocol by default, although this version can
be enabled by overriding tornado.websocket.WebSocketHandler.allow_draft76.

Updated to support the latest version of the protocol, as finalized
in RFC 6455.

Many bugs were fixed in all supported protocol versions.

tornado.websocket no longer supports the older “draft 76” version
of the websocket protocol by default, although this version can
be enabled by overriding tornado.websocket.WebSocketHandler.allow_draft76.